Ingersoll Rand 47722477001 Air Filter Element | Centac MSG

Product Overview

47722477001 is the intake air filter element for Ingersoll Rand centrifugal air compressors. It installs inside the intake filter assembly, upstream of the centrifugal impeller. Dust, grit and fibres are captured before they reach the impeller and intercooler.

This part belongs to the Ingersoll Rand centrifugal product line (CC), with item-level machine code P675 and machine group C675. Centrifugal compressors are 100% oil-free by design (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry contaminants away, particles deposit directly on the impeller and cooler surfaces — intake filtration requirements are therefore higher than for oil-injected screw compressors.

Key Specifications

• Part number: 47722477001
• Brand: Ingersoll Rand
• Product type: Air filter element (intake filtration)
• Product line: Centrifugal (CC)
• Item-level machine code: P675
• Machine group: C675
• Compatible machines: Ingersoll Rand centrifugal compressors — MSG TURBO-AIR / MSG Centac series and packaged systems
• Installation position: Inside the intake filter assembly, upstream of the centrifugal impeller
• Air quality: 100% oil-free, ISO 8573-1 Class 0

Technical Data

Filtration Performance

• Filtration rating: 5–10 μm
• Filtration efficiency: ≥98% for particles ≥5 μm
• Filter class: Characterised to ISO 5011 by efficiency, pressure drop and dust holding capacity — not by ventilation/HVAC class systems such as G4/F7

Flow and Pressure Drop

• Initial pressure drop: approx. 0.3–0.5 kPa (clean element)
• Operating differential: approx. 0.5–1.5 kPa as dust accumulates
• Typical replacement threshold: approx. 1.5–2.5 kPa; on centrifugal machines the intake depression gauge reading is the final criterion
• Energy relationship: every 1 kPa of added intake resistance raises the compression ratio by approx. 1%, increasing machine energy consumption by approx. 1.0%

Over its service life, intake resistance rises by more than 2 kPa, adding roughly 2% to machine energy consumption. On large, continuously running centrifugal machines this energy penalty typically exceeds the cost of the element itself — running past the pressure-drop threshold is not economical.

Construction and Materials

• Filter media: cellulose (wood-pulp fibre) filter paper, pleated construction
• Media weight: approx. 130 g/m²
• Inner/outer support: galvanised steel perforated cages, supporting the pleats on both sides
• End caps: metal or polyurethane, bonded to the media
• Seal: polyurethane or nitrile rubber, integral with or separate from the end cap
• Bonding: polyurethane adhesive for media-to-cap and media-to-cage fixing

Operating Conditions

• Operating temperature: -10 °C to +80 °C
• Relative humidity: ≤90% RH, non-condensing
• Collapse resistance: designed to withstand a differential pressure of at least 5 kPa across the media without deformation

Service Life and Storage

• Service interval: 2000 hours or 3 months, whichever comes first
• High-dust environments: reduce hours accordingly (e.g. approx. 1500 hours) and bring the time limit forward
• Storage life: use within 24 months; store dry, ventilated and out of direct light, protected from moisture and crushing
• Replacement criteria: intake depression gauge reading over limit, or media damage, debonding or a compressed seal face

Standards

• ISO 5011 — test method for intake filter efficiency and dust holding capacity
• ISO 8573-1 — compressed air quality classes; these machines are Class 0 (100% oil-free)
• Note: the ISO 2941 / 2942 / 2943 / 3723 / 3724 series often cited in aftermarket literature are hydraulic filter standards and do not apply to air filter elements

Installation and Maintenance

1. Confirm machine status and spare part. Check the machine nameplate model and group marking; verify the new element matches the old part number. Prepare the element, lint-free cloths and tools.
2. Shut down, depressurise, isolate. Follow the shutdown procedure and wait until the controller confirms zero speed. Lock out and tag the main power supply. This step is mandatory.
3. Verify the old element before dismantling. Read the stamped part number on the old end cap and note its position. Intake-stage and clean-stage elements carry different part numbers — this step prevents mis-selection.
4. Remove and inspect the old element. Lift it out vertically and check dust distribution and media condition. Replace immediately if the media is torn or perforated, the end cap has debonded, or the seal is compressed. Black oily sludge on the surface indicates abnormal oil mist in the intake air and should be investigated.
5. Clean the assembly interior. Wipe the inner walls and base with a lint-free cloth. Do not blow compressed air into the assembly — this drives dust into the intake duct.
6. Fit the new element. Install in the same orientation and position as the old part, observing seal face direction and clamping method. The element should sit without movement and the seal should be evenly compressed around its circumference.
7. Refit and confirm sealing. Replace the cover or clamp and tighten evenly. Check that the intake depression gauge impulse line is clear — a blocked line gives a false "clean" reading and is a common source of misjudgement.
8. Reset, test run, record. Reset the service timer, start the machine unloaded and observe the gauge reading and running sound. The gauge should be stable within the permitted range with no abnormal whistling (whistling usually indicates seal bypass). Record the machine hours as the start of the next interval.

Frequently Asked Questions

Which machines use 47722477001?

It is used on Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and packaged systems (item-level machine code P675, machine group C675). For a specific machine, confirm against the nameplate and the old element's part number.

Can it be fitted to an oil-injected screw compressor?

Not recommended. This element belongs to the centrifugal product line and is sized and interfaced for centrifugal intake assemblies. Oil-injected screw compressors use a different part number system; mixing them does not guarantee sealing or filtration performance.

What is the replacement interval?

2000 hours or 3 months, whichever comes first. In high-dust environments (cement, quarrying, mining, metalworking) reduce to approximately 1500 hours. The intake depression gauge reading is the final criterion — replace when it exceeds the limit, regardless of running hours.

Why do centrifugal machines demand more from intake filtration than screw machines?

Centrifugal compressors are oil-free, so no lubricating oil carries contaminants away. Particles deposit on the high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic imbalance and typically requires a shutdown and rotor rebalancing. Screw compressors have an oil film that partly transports contaminants, giving more tolerance.

Why are dimensions not listed?

Centrifugal machines are supplied as project-specific packages; intake assembly dimensions differ between groups and package scopes. Publishing a single size would be misleading. Measure the old element's outer diameter, inner diameter, overall height and seal type, or provide photos and the machine nameplate so we can cross-check by part number.

What happens when intake resistance rises?

Energy consumption increases — every 1 kPa of added intake resistance raises the compression ratio by about 1% and machine energy consumption by about 1%. Air intake volume also falls, reducing discharge volume. Running past the threshold costs more in electricity than the element saves.

Can an alternative element be used?

Yes, but verify three points: filtration rating, end-cap seal type and dimensions. If an alternative's seal type does not match the original, bypass occurs. On an oil-free centrifugal machine, bypass means particles reach the impeller directly — a higher risk than on oil-injected machines. Provide a photo of the old element and this part number when sourcing alternatives.

What should I do if there is abnormal whistling after installation?

Whistling usually indicates seal bypass: the element is not fully seated, the seal face is deformed, or the seal is missing. Stop the machine and check seating and seal condition. Also check that the intake depression gauge impulse line is not blocked.

How should spare elements be stored?

Store in a dry, ventilated place out of direct light, protected from moisture and heavy loads. Moisture reduces media strength; compression deforms the sealing fit. Use within 24 months.

Which elements in the same series are easily confused?

Ingersoll Rand centrifugal machines commonly carry both an intake-stage and a downstream clean-stage element. Part numbers and installation positions differ, as do filtration ratings, materials and seal types. Always confirm which stage you are ordering.

Compatible Machines

• Machine type: Centrifugal air compressor
• Product line: Ingersoll Rand centrifugal (CC)
• Series: MSG TURBO-AIR / MSG Centac
• Item-level machine code: P675
• Machine group: C675
• Air quality: 100% oil-free, ISO 8573-1 Class 0
• Typical applications: continuous clean oil-free air supply — food and beverage, pharmaceutical, electronics, textiles, pneumatic conveying

Representative model families (family-level reference; individual fitment must be confirmed by serial number): MSG TURBO-AIR TA / NX packaged units; MSG Centac standard pressure C series (C400, C700, C800, C1000, C3000 and others); MSG Centac high pressure C750, C1050, 2CII, 3C, 4C; and downstream equipment in the same packages such as dryers, filters and receivers.

Three-Step Verification

1. Read the stamped part number on the old element's end cap or cage and compare with the ordered part number.
2. Read the model and group marking on the machine nameplate and compare with the machine parts manual.
3. Confirm the installation position (intake stage or clean stage) — the two are not interchangeable.

If verification is still inconclusive, provide a nameplate photo, a photo of the old element showing the stamped part number, and the installation position. We will cross-check by part number before confirming.

Cross-series note: centrifugal elements and oil-injected screw elements belong to different part number systems and cannot be interchanged. Screw compressor intake filters are sized for external intake assemblies; direct substitution will cause seal failure.

Related Parts

• Sterile filter element 47722478001 — downstream sterile-grade filtration, removing microorganisms and fine particles for higher air purity requirements. Different filtration stage and part number; not interchangeable.
• Air filter assembly (housing) — carries and locates the intake element. Inspect clamps, seal faces and outlet for deformation or corrosion.
• Intake depression / differential pressure gauge — indicates intake resistance and is the final replacement criterion. Check the impulse line periodically for blockage.
• Seals — prevent bypass between element and assembly. Inspect together with the element; replace if compressed, hardened or missing.
• Gearbox and bearing lubricating oil and oil filter — for the centrifugal machine's gearbox and bearing lubrication system (not compression chamber oil). Replace per the machine parts manual and inspect alongside the intake element.

For items marked "—", refer to the machine-specific parts manual. Centrifugal machines are supplied as project packages, and listed companion part numbers correspond to the serial number of the applied machine.